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• <br /> WA <br /> =-RAZ <br /> Working To Restore Nature <br /> • <br /> 3164 Gold Camp Drive,Suite 200 <br /> Rancho Cordova,CA 95670 <br /> Phone (916)852-6690 <br /> FAX (916)852-6688 <br /> • <br /> July 30, 1993 <br /> Mr Bob Boust <br /> Unocal Corporation <br /> • P O Box 5155 <br /> San Ramon, California 94583 <br /> Subject Groundwater Monitoring,Second Quarter 1993, at Unocal Service Station No <br /> 2859, 1665 Pacific Avenue, Stockton, California <br /> • <br /> Mr Boust <br /> At Unocal Corporation's request, RESNA Industries has conducted the groundwater <br /> monitoring for the second quarter 1993 at the subject site (Plate 1) The work was <br /> conducted pursuant to our Site Safety Plan dated January 1, 1993 The data from the <br /> monitoring event are attached <br /> Potentiometric data and groundwater samples were collected from the onsite and offsite <br /> monitoring wells on June 4, 1993 The field methods used during the monitoring event are <br /> attached. At Unocal's request, equipment rinseate and purge water were removed from the <br /> site by RESNA Industries and transported to Gibson Oil & Refining Co . Inc in Redwood <br /> City, California <br /> Cumulative potentiometric and analytical data are summarized in Table 1 A <br /> Potentiometric Map was constructed from the groundwater elevation data (Plate 2) Copies <br /> • of the Chain of Custody Record(s) and analytical reports are attached <br /> The next monitoring event has been scheduled for September 1993 We recommend a copy <br /> of this report be forwarded to Ms Diane Hinson of the San Joaquin Local Health District, <br /> P O Box 2009, Stockton, California 95201, and Ms Elizabeth A Thayer of the California <br /> Regional Water Quality Control Board, Central Valley Region, 3443 Routter Road, <br /> Sacramento, California 95827-3098 <br /> • 0624bbou <br /> 38012-15 <br /> 0 <br />